Vol.1, No 5, 1998 pp. 569-575
UDC: 624.2/.8:539.32(045)

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Invited Paper ABOUT THE EQUIVALENT MODULUS
OF ELASTICITY OF CABLES OF CABLE-STAYED BRIDGES
N. Hajdin¹, G.T. Michaltsos², T.G. Konstantakopoulos^2
1 Serbian Academy of Sciences and Arts – Belgrade
² N.T.U.A. – Athens

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Abstract. The cables of cable-stayed bridges have a non-linear behaviour caused by their shape variation, when the stress conditions change. This is a most interesting theme, namely, the study of the effective cable modulus of elasticity on the exactness of the analysis, during the erection of the bridges.
In the present paper, we examine the influence of the neglected component of the weight of the cable, which is parallel to the direction of the chord of the cable. We obtain an easy used and useful formula by means of which we can estimate the exactitude of the well-known Dischinger's formula and, also, Hajdin's and other's one. We, finally, draw useful diagrams.

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EKVIVALENTNI MODUL ELASTIČNOSTI KABLOVA
KOD VISEĆIH MOSTOVA Kablovi kod visećih mostova imaju nelinearno ponašanje izazvano promenom njihovog oblika tokom naprezanja. Proučavanje ekvivalentnog modula elsatičnosti kablova je jako zanimljiva tema jer direktno utiče na tačnost analize tokom proračuna a zatim i na samo ponašanje izvedenog mosta.
U radu je ispitivan uticaj zanemarivanja komponente sopstvene težine kablova koja je paralelna sa njihovom osom. Izvedena je korisna formula koja je jednostavna za primenu a pomoću koje se može proceniti tačnost kako dobro poznate Dišingerove formule tako i Hajdinove i ostalih. Na kraju, u radu su dati i korisni dijagrami.